Mortar's Mate is a tool used in masonry work. It is a combination of a pestle and mortar, which is used to grind and mix materials such as cement, sand, and water. The pestle is the part of the tool that is used to grind the material, while the mortar is the container that holds the material. Mortar's Mate is an essential tool for any mason, as it allows them to quickly and efficiently mix materials for their projects.